I know a non-shotspotter effort to identify gunshot sound in a very different context which also is having a very hard time; there is a real unsolved technical

I know a non-shotspotter effort to identify gunshot sound in a very different context which also is having a very hard time; there is a real unsolved technical problem here. And it makes me think that ID'ing gun model from audio - which will be harder than simply identifying the existence of gunfire - is going to be very difficult.